Entanglement dynamics in atom-field interaction in the presence of noise: a special application of the Burshtein equation
Department of Physics, Abant Izzet Baysal University, Bolu, 14280, Turkey
Corresponding author: a email@example.com
Revised: 21 May 2008
Published online: 21 June 2008
The entanglement dynamics in a system of the interaction of an atom with a single-mode thermal field in the presence of noise is studied by the Jaynes-Cummings model. Two-state random phase telegraph noise is considered as the noise in the interaction and an exact solution to the model under this noise is obtained by the Burshtein equation. Although the Burshtein equation is applicable for laser-atom interactions, it is shown that it can be applied to atom-thermal field system as a special case. The solution is used to investigate the entanglement dynamics of the atom-field interaction by calculating a lower bound on concurrence. It is found that the entanglement is a non monotonic function of the intensity of the noise. The degree of the entanglement decreases to a minimum value for an optimal intensity of the noise and then increases for a sufficiently large intensity. Moreover, intense noise may generate stronger entanglement compared with the absence of noise.
PACS: 03.67.Bg – Entanglement production and manipulation / 03.67.-a – Quantum information / 42.50.-p – Quantum optics
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2008